Allergic to pain

I spent a few days down in Roseburg Oregon with some friends and wound up tweaking my ankle/knee. I can still walk on it but it hurts a bit. It didnt swell up a lot and I can move it around but if I move it a certain way it really hurts. I think its just a sprain or a strain...I have yet to go to a doctor as my insurance is not in effect right now. If it gets worse I will definately bite the bullet and go, I don't wanna have any permanent sort of injuries cause something doesnt heal right.